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Library of Congress Subject Areas (21343)
- A General Works (124)
  - AC Collections. Series. Collected works (38)
  - AI Indexes (General) (39)
  - AM Museums (General). Collectors and collecting (General) (6)
  - AS Academies and learned societies (General) (47)
  - AZ History of Scholarship The Humanities (5)
- B Philosophy. Psychology. Religion (50)
  - B Philosophy (General) (4)
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- C Auxiliary Sciences of History (8)
  - C Auxiliary sciences of history (General) (1)
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    - CD921 Archives (1)
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- D History General and Old World (9)
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- E History America (1)
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- F History United States, Canada, Latin America (1)
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- G Geography. Anthropology. Recreation (66)
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- H Social Sciences (7214)
  - H Social Sciences (General) (1587)
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  - HB Economic Theory (568)
  - HC Economics (1925)
  - HD Industries. Land use. Labor (937)
    - HD1401 Agriculture-Economic aspects (109)
    - HD28 Management. Industrial Management (333)
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- J Political Science (1076)
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- L Education (914)
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- M Music and Books on Music (20)
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- N Fine Arts (1142)
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    - N400-3990 Art museums, galleries, etc. (19)
    - N61-72 Theory. Philosophy. Aesthetics of the visual arts (54)
    - N81-390 Study and teaching. Research (56)
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  - NA Architecture (474)
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  - NX Arts in general (164)
- P Language and Literature (458)
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- Q Science (1677)
  - Q Science (General) (498)
  - QA Mathematics (909)
    - QA76.87 Neural computers (49)
    - QA75 Electronic computers. Computer science (254)
    - QA76 Computer software (204)
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  - QC Physics (49)
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- R Medicine (32)
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    - RA1001 Forensic Medicine. Medical jurisprudence. Legal medicine (1)
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  - RS Pharmacy and materia medica (2)
  - RZ Other systems of medicine (1)
- S Agriculture (1829)
  - S Agriculture (General) (1569)
    - S590-599.9 Soils. Soil science (208)
    - S631-667 Fertilizers and Improvement of the soil (178)
  - SB Plant culture (321)
    - SB599-990.5 Pests and Diseases (86)
    - SB950-989 Pest Control and Treatment of Diseases, Plant Protection (152)
  - SD Forestry (40)
  - SF Animal culture (27)
  - SH Aquaculture. Fisheries. Angling (32)
  - SK Hunting sports (2)
- T Technology (6844)
  - T Technology (General) (2402)
    - T55.4-60.8 Industrial engineering. Management engineering (539)
    - T201 Patents. Trademarks (8)
    - T385 Computer Graphics (144)
    - T58.6-58.62 Management Information Systems (676)
  - TA Engineering (General). Civil engineering (General) (737)
  - TC Hydraulic engineering. Ocean engineering (13)
  - TD Environmental technology. Sanitary engineering (1164)
  - TE Highway engineering. Roads and pavements (63)
  - TF Railroad engineering and operation (14)
  - TG Bridge engineering (12)
  - TH Building construction (92)
  - TJ Mechanical engineering and machinery (96)
  - TK Electrical engineering. Electronics Nuclear engineering (122)
    - TK5105 Computer Network (50)
    - TK5105.882 Internet (46)
    - TK5105.888 World Wild Web (51)
  - TL Motor vehicles. Aeronautics. Astronautics (6)
  - TN Mining engineering. Metallurgy (9)
  - TP Chemical technology (2312)
    - TP155 Chemical engineering (1770)
    - TP368 Food processing and manufacture (399)
    - TP500 Fermentation industries. Beverages. Alcohol (17)
  - TR Photography (14)
  - TS Manufactures (282)
    - TS 155-194 Production Management, Operations Management (198)
    - TS 180-TS180.8 Material Handling (15)
  - TT Handicrafts Arts and crafts (14)
  - TX Home economics (21)
- U Military Science (9)
  - U Military Science (General) (9)
- V Naval Science (7)
  - V Naval Science (General) (2)
  - VM Naval architecture. Shipbuilding. Marine engineering (5)
- Z Bibliography. Library Science. Information Resources (83)
  - Z004 Books. Writing. Paleography (5)
  - Z665 Library Science. Information Science (45)
  - Z719 Libraries (General) (13)
  - ZA Information resources (30)
    - ZA4050 Electronic information resources (10)
    - ZA4450 Databases (16)